Gas-heater



I. W. PIATT.

GAS HEATER. I APPLICATION FILED NOV. 30| 1917.

1,352,473. Patentedsept. 14,1920.

2 SHEETS-SHEET l.

J. W. PIATT.

GAS HEATER.

APPLICATION FILED NOV. 30, |917. I 1,352,473. PatentedSept. 14,1920.

2 SHEETS-SHEET 2. .E Ig. .3

, /NVE/voff: J WPL'tt UNITED STATES JOSEPH W. PIATT, or NEW YORK, iv. Y.

PATENT OFFICE.

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Specification of Letters Patent. Pate/nigga 14, 1920.

Application led November 30, 1917. Serial No. 204,710.

To all whom t may conce/rfa Bey it known that "I, JOSEPH W. PIATT, a

citizen of the United `States, and a resident of theborough of Manhattan, in the city,

county, and State of New York, have inventedV certain new and useful Improvements in Gas-Heaters, of which the followin is a specification. l

lhfis invention relates to gas heaters, particularly adapted to heat water for a hot Water supply or for the generation of steam, and it isthe primary objectof the invention to improve the generalconstruction of heatters of this character to reduce the consumption of gas or fuelfand at the same time in-:j

crease `the heating efiiciency of the heater.

In heaters of this character a tubular water unit is provided lwith ra heat retaining jacket to inclose said unit and a gas burner is placed below said unit with the combustion chamber 'between 'said unit and the burner. As vis wellkno'wn for the proper combustion of'gaseous fuel it is necessary to provide a secondary air supply at the point with the result 4that a considerable portion y` ofthe vheat is carried oi'l' with the products of combustion, thereby Vinipairing the eiliciency of the heater. Furthermore, 'iii Ordei' to `eifect the propercombustion ofthe gas, it is essential that the supply of secondary air `be in proper proportion, as to supply too much air is just as inefiicient as an insuiiicient supply.

It is an Objectof the invention to over! come the above disadvantages'aiid to lprovidev a Asecondary air'sup'ply chamber' having anfoutlet leading into the 'combustion chamber adjacentthe point where combustion is l taking place and to provide means to regulate the flow'of air throughfsaid lchambery to the combustion chamber.y

` Other objects andadvantages ,willhereinafter appear. f y

l.similarhead (iiot l shown).

As thus constructed there is av flue" In the drawings accompanying andfforming a part of this specification Figure 1 is .a sectional side elevation of a heater kwith an embodiment of my invention applied thereto. l

Fig. 2 is a sectional plan vie-W taken substantially on the line 2-2 ofFig. 1; and

F ig. 3 is a sectional plan view to illustrate the means to control the secondary air supply to the' combustion chamber.

Similar characters of reference designate like parts throughout the different views of l the drawings.V

'In the drawings I have shown an embodiment ofiny invention in connection with a lie-ateiI comprising a heating orvvvater unit,

shown as a series of vertical tubes 4, connected yat the lower ends to awater supply and iii circuit with awater or steam circulating systemby a pipe 5 through a head (i, and connected at the yupper ends to a The top and sides of the heating or water unit are inclosed by a jacket 'T supported upon a base 9 and which may alsoserve to support the heating unit, with the ybottom of the jacket communicating with said base and having an out-let Hue 10 at the top for the escape of the products of combustion. f

Aburner 11 is supported uponan annular flange 12 within the Vbase by brackets 13, :14 aiidlias a .gas fuel inlet 14: controlled by a valve 'l5 through a mixing j chamber 16.

This burner is of the type commonly known.

asa tangential burner, the fuel or gaseous mixture 'enteringV the kburner chamber or chambers in a line tangent to the burner, and is of the type disclosed in my co-pending application filed Nov.` y10, 1916, kPatent "No 1,267,448, granted May 28, 1918, in which the buriierliasa series of concentric ychambers witli'air spaces, as shown at`17 in Fig. I

2, between the respective chambers.

For the proper Ycombustion of gaseous fuels it is necessary to provide a suitable air "supply to mix with the gas which is usually) supplied through a` mixing chamber as shown at 1G. .floweven to increase the rcombustible eiiiciency, of suoli mixture a proper secondary air supply inustalso be provided to the combustible gases at the point of combustion or the burner ports, and this air sup` plyvnniust be in proper proportion to the gas,l too great a supply ofairbeing as in- 'eiiicient as van insufficient supply.l For this purpose I provide a secondary air chamiio ber 18 within the base, said chamber being substantially of truncated cone shape, open at the top and bottom, that is, the walls diverge from the top, as clearly shown in Fig. 1, the opening at the top being adjacent the top of the burner with the walls spaced therefrom, as shown at 19, to provide an outlet for the air chamber adjacent the burner ports or about the combustion chamber.

An annular wall 2O extends downward from the j aclret T and converges toward the top of the burner, where it is connected to the air chamber, or it may constitute a part of the wall of this chamber, the wall 20 orming a combustion chamber between the burner and the heating unit.

The flow of airthrough the secondary air chamber through the outlet 19 and burner spaces 17 to the combustion chamber is controlled or regulated by a valve or shutter 21 in the form of a plate to conform to the contour of the inner wall of the secondary air chamber and located adj acent the bottom thereoia to serve as a closure for the bottom of such chamber and adapted to be adjusted to provide a space between the lateral edges of the plate and the walls o* the secondary air chamber for the passage of air to said chamber. To adjust the plate to regulate this space to increase or decrease the area thereof the plate is mounted to have vertical adjustment. Thermostatically operated means are provided to automatically adjust this valve or plate to regulate the air inlet to the secondary air chamber and comprises a thermo stat (shown in a general way at T) connected in the circulation of the heater and operatively connected to the plate by an angle lever 22 one arm of which is connected to the thermostat, as at 23, and the other arm connected by a link 24 to one end of a lever 25, the other end of the latter lever being connected, as at 26, to a lever 27, the other end of said latter lever being connected to the plate, as at 28, and the plate having, a stud 29 by which it is slidably supported in the bracket 14, a spring 30 normally urging the plate downward.

To supply air to the secondary air chamber from the exterior of the building in which the heater may be located, a closure 31 is provided for the bottom of the air chamber having an inlet 32 to which a pipe 33 is connected leading from `the exterior ot the building, and which pipe may also serve to supply fresh air to the mixing chamber 16 by connecting said chamber through a pipe 34 with the pipe 33. To permit of adjustment of the burner the opening 35 in the base through which the burner '.ilet extends is enlarged, but is at all times maintained closed by a collar or plate 36 tarried by the tubular inlet of the burner.

It is well known that by heating air it will more readily mix with a gaseous fuel and produces a better combustible mixture, and by the provision o1 the air chamber 18 said chamber also serves as a heating chamber for the air which enters at the bottom, and as it passes from said chamber to the combustion chamber through the outlet 19 adjacent the burner ports it will be heated to such a. degree that the air will expand whereby the elements o1"- the air are more readily taken up by the flame or burning gaseous mixture and enable the burning gas to absorb the inal oxygen necessary for Y complete combustion from a comparatively small amount of secondary air thus reducing the dilution of the burning gases by excess secondary air.

Having thus described my invention I crease the space between the lateral edges of the plate and the walls of the air chamber, sullstantially as and for the purpose speci- 2. In a gas heater, the combination of a combustion chamber; a burner at the base oi said chamber; a secondary air supply to the burner consisting of a chamber the wall ot which extends around and diverges downward from the top of the burner adjacent the burner ports and spaced from the wall of the burner to constitute an outlet'of said chamber adjacent the burner ports; a plate supported at the lower end of the air chamber to have adjustment in a vertical direc` tion with the lateral edges spaced from the walls of the chamber; means to normally urge said plate downward; and means to adjust the plate upward against said latter means, substantially as and for the purpose specified.

3. In a gas heater, the combination of a combustion chamber; a burner at the base of said chamber; a secondary air chamber the wall of which extends around and diverges downward from the top of the burner, with the wall of said chamber spaced from the wall of the burner adjacent the burner ports to constitute an annular outlet for the chamber and an inlet to the bottom thereof; and a plate at said airchamber having a space between the lateral edges and the walls of the air chamber, said plate being vertically adjustable to increase or decrease said space und thereby regulate the flow of air through said chamber to the combustion chamber, substantially as and for the purpose specified.

4. In u gus heater, the combination of e heating unit and a heat retaining acket to inolose the seme; a burner below said unit; an annular wall extending from the bottom of the jacket and converging to adjacent the burner to provide a combustion chamber be tween the burner and unit; an air chamber extending downward from the burner and having an outlet leading to the combustion chamber adjacent the burner ports `and an air inlet; and means in said chamber to regulate the flow of air through said chamber to the comb ustion'chamber, substantially as and for the purpose specied.

Signed at New York cit in the county of New York and State kof ew York, this 2d day of December, 1916.

JOSEPH W. PIATT. 

